Hi Dennis, Thanks a lot for your feedback!
So I ended up using a direct solver, which works fine for my problem (2 phases, around 500k cells). Best regards, Nikolai From: Dumux <[email protected]> On Behalf Of Dennis Glaser Sent: Friday, August 31, 2018 20:27 To: [email protected] Subject: Re: [DuMuX] Linear solver crash Hi Nikolai, I think the solver chosen in the exercise is not optimal for the matrix structures you have in the coupled fracture problem. We are still trying to find better solution strategies, however, in dumux/linear/seqsolverbackend.hh you can find two solvers that are designed for matrix structures like the one you have: BlockDiagILU0BiCGSTABSolver BlockDiagAMGBiCGSTABSolver You can try these although I wouldn't put too much hope in it solving your problem. You can always use a direct solver if your system is not too big, i.e. the UMFPackBackend or the SuperLUBackend. These should always work but might need a lot of memory and much more cpu time. You need to have umfpack and/or superlu installed though. I hope this helps! Best wishes, Dennis On 31.08.2018 16:13, Nikolai Andrianov wrote: Dear DuMuX experts, While working on a modification of the dumux-course/exercises/exercise-fractures test case I observed that the linear solver crashes if the mesh is too fine. This results in cutting the Newton's time step, which in my case however does not help either.. This behavior is illustrated on the https://git.iws.uni-stuttgart.de/andrian/rate-sensitivity project on github: depending on the mesh density specified in the .geo files grids/fracs_bad.geo or grids/fracs_ok.geo, the linear solver either crashes, or the simulation proceeds as expected. Your feedback is greatly appreciated. Many thanks, Nikolai _______________________________________________ Dumux mailing list [email protected]<mailto:[email protected]> https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
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